High-performance gas sensor based on ZnO nanowires functionalized by Au nanoparticles

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• 作者：Jing GuoAuthor Vitae ; Jun Zhang ; ^{mse_zhangj@ujn.edu.cn" class="auth_mail}Author Vitae ; Min ZhuAuthor Vitae ; Dianxing JuAuthor Vitae ; Hongyan XuAuthor Vitae ; Bingqiang Cao ; ^{mse_caobq@ujn.edu.cn" class="auth_mail}Author Vitae
• 关键词：ZnO ; Nanorods ; Au ; Sensor ; High performance
• 刊名：Sensors and Actuators B: Chemical
• 出版年：August 2014
• 年：2014
• 卷：199
• 期：Complete
• 页码：339-345
• 全文大小：2157 K

文摘

One-dimensional (1D) semiconductor nanostructure has been widely used for gas sensor devices. In this work, a high performance gas sensor based on Au-functionalized ZnO nanorods was fabricated. Au nanoparticles were successfully immobilized onto the surface of ZnO nanorods to serve as a sensitizer by a facile solution reduction process. The hybrid Au/ZnO nanorods have been systematically characterized by XRD, SEM, EDS, TEM and optical absorption spectrum. Gas sensing tests reveal that the Au/ZnO sensor has remarkably enhanced performance compared to pure ZnO. It could detect ethanol gas in a wide concentration range with very high response, fast response–recovery time, good selectivity and stable repeatability. The possible sensing mechanism is discussed. The superior sensing features indicate the present Au/ZnO nanorods are promising for gas sensors.